The lymphatic system is usually considered part of the ____________ system.

The lymphatic system is usually considered part of the
circulatory system.

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"The lymphatic system consists of organs, ducts,
and nodes. It transports a watery clear fluid called lymph. This fluid distributes
immune cells and other factors throughout the body. It also interacts with the blood
circulatory system to drain fluid from cells and tissues."

The main function of the
lymphatic system is to defend the body against diseases, absorb fats from the intestines
and transport them to the blood, and to collect and return interstitial fluid, including
plasma protein to the blood. 

The lymph organs are
comprised of bone marrow, lymph nodes, spleen, and thymus.